Despite using an electric stun gun on him the muscly student wouldn't let go of Mr Stevens.

It was only when he was bitten by a police dog that he could be overpowered.

Ms Mishcon's body was then found.

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The police stun gun officers say they used on the 19-year-oldCredit: Martin County Attorney's Office

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A bloody Nike trainer found near the murder sceneCredit: Martin County Attorney's Office

According to police reports, the former college footballer had been acting strangely in the run up to the attack.

His mother told police he claimed to have superpowers and thought there were demons in the house.

Harrouff's father, Wade Harrouff, told investigators they had gone for a walk the afternoon before the killings and came across two turtle shells. He said his son pulled out a knife and said something was going to happen.

He said he convinced his son to put away the knife, which was later found near the victims.

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A police dog was needed to help tackle the American football playerCredit: Martin County Attorney's Office

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Splatters of blood were found at the couple's homeCredit: Martin County Attorney's Office

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Harrouff's attorney said that her client is mentally illCredit: Eyevine

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A letter Austin Harrouff wrote to himself on January 6, 2014Credit: Martin County Attorney's Office

After a bizarre family meal at a nearby sports bar, where Harrouff tried to eat cooking oil, he walked the four miles to the couple's home.

The crime reports details a brutal attack, with blood found all over the couple's driveway and their bodies displaying major wounds.

Both were pronounced dead at the scene.

The court was also told on Wednesday the Florida college student had no detectable hallucinogenic drugs in his system, according an FBI toxicology report.

Nellie King, Harrouff's attorney, said Wednesday that her client is mentally ill.

Harrouff has pleaded not guilty to first-degree murder and other charges. He could face the death penalty if convicted.